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. 2014;24(2):109-16.
doi: 10.2188/jea.je20130017. Epub 2014 Feb 15.

Trends in prevalence of overweight and obesity in Korean adults, 1998-2009: the Korean National Health and Nutrition Examination Survey

Hee-Taik Kang  1 , Jae-Yong Shim, Hye-Ree Lee, Byoung-Jin Park, John A Linton, Yong-Jae Lee
Affiliations

Trends in prevalence of overweight and obesity in Korean adults, 1998-2009: the Korean National Health and Nutrition Examination Survey

Hee-Taik Kang et al. J Epidemiol. 2014.

Abstract

Background: Although obesity is increasing worldwide and becoming a major public health problem, some countries report a trend toward stabilization. We investigated prevalence trends in overweight/obesity and obesity among Korean adults during a 12-year period.

Methods: This study was based on the Korean National Health and Nutrition Examination Survey (KNHANES) I (1998), II (2001), III (2005), and IV (2007-2009). The χ(2) and ANOVA tests were used to compare the prevalence and mean values for age and BMI, respectively. P-values for trends were determined by linear and logistic regression analyses, with KNHANES phase as the continuous variable.

Results: The prevalences of overweight/obesity in KNHANES I through IV were 50.8%, 57.4%, 62.5%, and 62.6%, respectively, among men (P for trend = 0.002, β = 0.021) and 47.3%, 51.9%, 50.0%, and 48.9% among women (P for trend = 0.017, β = -0.015). The respective prevalences of obesity were 26.0%, 32.4%, 35.1%, and 36.3% among men (P for trend = 0.006, β = 0.018) and 26.5%, 29.3%, 28.0%, and 27.6% among women (P for trend = 0.143, β = -0.008). During the same period, the respective prevalences of grade 2 obesity (BMI ≥30 kg/m(2)) were 1.7%, 2.8%, 3.6%, and 3.8% among men (P for trend = 0.075, β = 0.005) and 3.0%, 3.5%, 3.4%, and 4.0% among women (P for trend = 0.398, β = 0.003).

Conclusions: The prevalences of overweight/obesity and obesity showed an upward trend among men during the 12-year period, whereas the prevalence of overweight/obesity slightly decreased among women from 2001.

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Figures

Figure 1.
Figure 1.. Prevalence of overweight/obesity, grade 1 obesity, and grade 2 obesity in men and women, according to KNHANES phase. P-values represent difference in prevalences of overweight/obesity, grade 1 obesity, and grade 2 obesity among KNHANES phases (calculated by χ2 test). P-values for trends were determined by logistic regression analyses after setting KNHANES phase as the continuous variable. Definition: overweight/obesity, BMI ≥23 kg/m2; grade 1 obesity, BMI ≥25 kg/m2; grade 2 obesity, BMI ≥30 kg/m2.
Figure 2.
Figure 2.. Odds ratios estimated by adjusting age groups (20–39 years, 40–59 years, and ≥60 years) for the prevalence of overweight and obesity in men and women, according to KNHANES phase. P-values for trends were determined by logistic regression analyses after setting KNHANES phase as the continuous variable. Definition: overweight/obesity, BMI ≥23 kg/m2; grade 1 obesity, BMI ≥25 kg/m2; grade 2 obesity, BMI ≥30 kg/m2.
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